document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=397637>Question 397637</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the area of a circular ring is 90.If the radius of the outter circle forming the ring is 10, what is the radius of the inner ring?! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #281716 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=281716\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let r = radius of inner ring.<BR>\n" );
document.write( "Then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%5E2pi+-+r%5E2pi+=+90 ALIGN=MIDDLE  ALT=\"10%5E2pi+-+r%5E2pi+=+90\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=100+-+r%5E2+=+90%2Fpi ALIGN=MIDDLE  ALT=\"100+-+r%5E2+=+90%2Fpi\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2+=+100+-+90%2Fpi ALIGN=MIDDLE  ALT=\"r%5E2+=+100+-+90%2Fpi\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "==> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r+=+sqrt%28100+-+90%2Fpi%29+=+8.447 ALIGN=MIDDLE  ALT=\"r+=+sqrt%28100+-+90%2Fpi%29+=+8.447\"   DISABLED_style= \"max-width:90%; height:auto;\" >, to 3 decimal places. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );